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Improved security system for a portable data carrier

  • US 4,816,654 A
  • Filed: 05/16/1986
  • Issued: 03/28/1989
  • Est. Priority Date: 05/16/1986
  • Status: Expired due to Term
First Claim
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1. A portable data carrier system comprising:

  • a portable data carrier for storing and processing alterable data, the portable data carrier including both a computer for providing an executive operating system on the portable data carrier and an alterable memory for providing data to the computer for operating the executive operating system, the executive operating system providing a data input/output interface means for the portable data carrier, and creating multiple files in a data segment region of the alterable memory for storing the alterable data associated with each file, the size of each file and placement of the data for each file in the data segment region being controlled by the executive operating system and the data for each file being allocatable at any of multiple available locations throughout the data segment region by the executive operating system;

    an application station for processing data from the portable data carrier; and

    communication means for providing communications between the application station and the portable data carrier, the application station communicating with the portable data carrier over the communication means through command primitives, responsive to the command primitives, the executive operating system accessing the alterable data for reading therefrom and writing thereto, and providing this data to the application station via the communication means.

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